AIP replication: PREMIS:OBJECT relationship fixes
AIP replication: PREMIS:OBJECT relationship fixes

Fixed a bug where AIP replication-related logic was failing to copy
existing PREMIS:OBJECT relationship elements from existing pointer files
when creating new pointer files derived from the old ones.

artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service